Concrete form



k Ez. BAUMANN CONCRETE. FORM;

Filed Aug. 1 1 924 A TTORNE Y.

' Sary- Patented June 23, 1925.

UNITED STATES ALFRED E. BAMANN, OF'MILEVAU-KEE, KVISCONSIN.

CONCRETE FORM.

Application filed August 1,1924. Serial No. 723,521.

i o all whomfz't may concern.'

Be it known that l, ALFRED E. BAUMANN, a `citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of v,l'isconsin, have invented new and useful Improvements in Concrete Forms, lof which the `following is a description, reference being had to the accompany# ing drawings, whichare a part of this specification.

rlhe invention relates to forms for laying 'concrete,'and more particularly for those used in building stairways.

The usual method of fabricating forms for building concrete stairways consists of providing spaced inclined side form members joined by transversely extending riser form members held thereon by cleats, thin pieces of curved sheet metal being nailed to these members at their abutment to form rounded corners at the ends of the risers. The preparation of the forms consumes a large portion .of the time required to complete 'the stairway, and after the concrete has set it is difficult to dismantle the forms without caus ing considerable ldamage to the concrete surfaces, which makes extensive patching neceslt is an provide corner form members for concrete stairways and the like which will facilitate Jthe erection and dismantling of the other form members with which it cooperates, whereby economies will be effected in labor, and damage tothe concrete surfaces will be minimized.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the accompanying drawings: Fig. 1 is a fragmentary plan view of an assembled stairway form embodying the corner form member of the invention;

Fig. 2 is a longitudinal sectional view thereof, showing the concrete partially poured; and

Fig. 3 is a sectional view on a horizontal plane through the cornerl form member attached to its cooperating form members.

In these drawings, indicates the usual inclined form members which are planks having their inner faces spaced from each other the width of the stairway, and 11 the transversely extending riser form members.

object of the present invention to v' rlhe form members 10 and 11 are connected in their assembled relation by the corner or junction form members of this invention. Each of the corner form members comprises an angle bracket 12 of a height for producing the riser desired and consists preferably of separate portions 13 and 1d secured together, 13 being the side portion and 14 the front portion, both being suitably flanged, if necessary for rigidity when thin sheet metal is used.

The side portion 13 is adapted to abut against the inner face of the'inclined form member, and is provided with slots 15 in its rear edge to receive fastening nails 16 driven into the inclined form member, and slots 17 in its front edge 'to receive fastening'. screws 18, the front edge projecting beyond the front portion lll'of the bracket 'to afford facility in reaching the screws.

The front and side 'portions 13 and lll of the bracket are joined by a fillet member 19 to form a curved end on the step, but may be omittedfif square corners are desired.

ln order to ysecure the transverse riser form members-to the brackets each ofthe brackets is 4proi'fided with a plate 2O having aligned ears 21 pivotally mounted on the forwardly extending flanges 21 of 'the front Aportion of the bracket by rivets 22. vThe riser form members are adapted to fit between the fianges 21 of 'each bracket, and the pivoted plate Q0 is pressed into engagement 'with it by thumb screws 23 threaded on bolts 24; secured to the bracket and passing through slots 25 in the plate. rlhe plate is also provided with stiffening flanges Q6 which are preferably oset from the top and bottom edges so as not to interfere with tr-oweling. y l 4 After Athe riser form members have been clamped at each end in the b'rackets'and the brackets havev been secured to the inclined side members, as hereinbefore described, to obtain the desired width ofstep, the completed forms are ready to receive the concrete aggregate, which is troweled in the usual manner. After the concrete has set the riser form members are readily removed from the brackets after loosening the thumb nuts to permit the pivoted plates to be swung out. The screws 18 at the front of the corner brackets are then removed, which permits the brackets to be readily pulled forwardly along the side form members from the attaching nails 16 disposed in the slots in the rear edge of the brackets, after which the inclined side members can be lifted out of place. The removal of the form members is thus accomplished without disturbinoY the concrete, and obviates subsequent patching operations.

The outward pressure of the concrete on the riser form members is taken at the screws 18, which are accordingly preferred to nails for this purpose, and the riser form members need not be cut accurately as to length provided suiiicient clamping surface is present between the front portion 13 of the corner bracket and the clamping plate 20.

The bracket of this invention is also useful in forming the corners of concrete slabs in general, as in side walks.

lf2/*hat l claim as new and desire to securev by lietters Patent is:

1. l1 corner form for concrete stairways comprising a concrete-retaining angle bracket having a portion for receiving the end of a riser form member in laterally7 removable clamping engagement and another portion for attachment to the inner face of an inclinedside form member and adapted for removal from and along said inclined side member after the concrete has set.

2. A corner form for laid concrete comprising a concrete-retaining angle bracket, a clamping plate pivotally mounted thereon and cooperating with one portion thereof reta ning the end or" one form member etween them in removable clamping enagement, and another portion for receivng a second form member at an angle to said first-named form member and adapted for removal from and along said second member after the concrete has set.

3. A corner form for laid concrete comprising a concrete-retaining angle bracket having a portion for receiving one Jform member in laterally removable clamping engagement and another portion for abutment against the inner face of a second form member at an angle to said firstnamed form member and having slots in its end edge adapted to receive headed fastening members secured into said second form member, whereby said bracket can be removed from and along said second Jform member after the concrete has set.

a. A corner form for laid concrete comprising a concrete-retaining bracket having a portion for receiving one form member in laterally removable clamping engagement and another portion Jfor abutment against the inner face of a second form member at an angle to said first-named form member and having slots in its rear edge and openings at its front edge adapted to receive headed fastening members secured to said second form member whereby said bracket can be removed from and along said second form member after removing said lastnamed fastening members when the concrete has set.

5. A corner form for laid concrete comprising a concrete-retaining bracket having a flanged portion for receiving a form member against vertical movement, a clamping plate pivotally mounted on said bracket and cooperating with said flanged portion for retaining said form member between them in removable clamping engagement, and another portion for receiving a second form member at an angle to said first-named form member and adapted for removal from and along said second form member after the concrete has set.

6. A. corner form for concrete stairways comprising a concrete-retaining bracket having a flanged portion for receiving riser form member against vertical movement, a clamping plate pivotally mounted en said bracket and cooperating with said flanged portion for retaining said riser form member in laterally removable clamping engagement, and another portion adapted to abut against an inclined side form member, and having slots in its rear edge for receiving` headed fastening members secured to said inclined member and openings at its front edge for receiving removable headed fastening members, whereby said bracket can be removed from and along said inclined form member after the concrete has set.

In testimony whereof I affix my sio'nature.

ALFRED n. BAUMNN. 

